A STUDY OF SHELLED CORN 101 



servation as yellow, white, or mixed, according to the rules 

 governing the inspection and grading of corn that are in- 

 cluded in this exercise. Record the class name in the col- 

 umn for that sample number for classification. 



Spread the sample out on a blank piece of paper and make 

 a detailed study for each of the divisions given below. 



Purity. Make a study of purity by separating the 

 sample into the following groups : corn, other grains, 

 foreign matter. Weigh each group and record its weight 

 and percentage in the blank form in the column of the sample 

 number. Weigh to one half of one gram. Quantities less 

 than one half of one gram may be indicated as " trace." 

 All the groups of the division should total 100 per cent for 

 purity. 



For the remainder of the determinations in the study 

 of this exercise use twenty-five grams of the corn from which 

 other grain and foreign matter have been removed. 



Condition. Make a study of condition by separating 

 this sample into the following groups : sound kernels ; 

 cracked or broken kernels; rotten, decayed, or otherwise 

 injured kernels. Weigh and record the weight and per cent of 

 each group. The total for condition should be 100 per cent. 



Color. The predominating colors in corn are white and 

 yellow. Other common colors are red, speckled, and blue. 

 Corn of the latter colors are less likely to be pure in color 

 in large lots, and are usually designated as mixed. Make 

 a study of color by separating the sample into the following 

 groups : white, yellow, and mixed. Weigh and record the 

 weight and per cent in each group. The total for color 

 should be 100 per cent. 



